JPS60159051A - Coated sheet-shaped material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sheet-like article, which is used as a synthetic paper, a color sheet, or a tracing paper, and is a plastic sheet coated with a surface layer.

BACKGROUND OF THE INVENTION Sheet-like products in which a surface layer is coated on a plastic sheet are well known and have been put to practical use in various products such as 2-synthetic paper, but the conventional products have some drawbacks.

That is, in the conventional sheet-like products of this type, a coating liquid is prepared by dispersing and dissolving appropriate surface layer components in a solvent, and this coating liquid is applied onto a plastic sheet, and then brought into contact with water to disperse the solvent. They were manufactured either by a wet method in which the plastic sheet was coated with a coating solution and then dried, or by a dry method in which the plastic sheet coated with the coating solution was dried as is, but regardless of which method is used, if an organic solvent is used as the solvent On the other hand, if water is used as the solvent, there is no such problem, but if the resulting sheet material is soaked in water and rubbed, the surface layer tends to peel off, and the plastic sheet is particularly susceptible to polyolefin. Another drawback is that it is difficult to obtain adhesion to the surface layer and requires special preparation such as undercoating.

Purpose of the Invention The present invention solves the above-mentioned difficulties of the prior art, and provides a sheet-like product that improves the water resistance of the surface layer and provides good adhesion to polyolefin plastic sheets without an undercoat. It is intended to.

Solution The configuration adopted by the present invention to achieve the above object is to apply an aqueous coating liquid containing an electron beam curable resin onto a plastic sheet, dry the dispersion medium such as water, and then irradiate the plastic sheet with an electron beam. According to the present invention, a surface layer is formed on the plastic sheet.

Composition of the invention The present invention will be explained in detail below.

The sheet-like product of the present invention is obtained by coating a plastic sheet with an aqueous coating liquid in which an electron beam curable resin is dispersed or dissolved in water, drying it, and then irradiating it with an electron beam to form a surface layer. The plastic sheet used for this can be selected from those made of polyvinyl chloride, polypropylene, polystyrene, polyethylene terephthalate, etc., and other plastics, but coating on polyolefin plastic sheets is particularly difficult for the reasons described below. This eliminates the need for an undercoat, which is economically advantageous.

Additionally, the composition of the aqueous coating solution applied to this plastic sheet is basically a binder such as latex, a filler such as clay, and an electron beam curing material such as trimethylolpropane trimethacrylate or 1,6-hexanediol diacrylate. This composition is made by dispersing or dissolving a plastic resin in water, and the composition is selected and changed depending on the intended use of the obtained sheet-like material, and a coloring agent or the like is added as necessary.

On the other hand, in order to apply the coating liquid to the plastic sheet I-, a known method such as using an air knife coater may be used.
Any conventionally known device can be used as long as it can irradiate an electron beam of approximately 5 mA and 5 Mrad.

In addition, in order to improve the adhesion with the plastic sheet and emphasize the characteristics of the surface layer, the surface layer was coated with an undercoat liquid and a topcoat liquid of different compositions, and then dried and electronically coated in the same manner as above. It may also be made up of multiple layers by irradiation with radiation.

Description of examples Next, embodiments of the present invention will be described.

Example 1 Water (solvent) 200 parts Clay (filler) 90 parts Sachin White (II) 10 parts Sodium tripolyphosphate (dispersant) 1 part Casein (
Binder) 10 parts latex (Binder) 12 parts Trimethylolpropane trimethacrylate - 1 to (electron beam curable resin) 6 parts Coating solution was applied to a 50μ polypropylene film.
- was coated using an air knife coater and dried. The thickness of the coating layer was 25μ.

This one has 175Kv, 5 IIIA, 10Mra
The white sheet-like material obtained by irradiating the electron beam under the conditions of d was resistant to peeling with cellophane tape and did not peel off even when rubbed in water.

Example 2 Water (solvent) 100 parts Clay (filler) 10 parts Sodium tripolyphosphate (dispersant) 0.1 part casein
(Binder) 10 parts Latex (Binder) 10 parts 1.6 Hexanediol diacrylate (electron beam curable resin) 10 parts Phthalocyanine blue (coloring agent) 0.5 parts It was coated on a film (IC: Melinex 524 manufactured by I Company) and dried. The thickness of the coating layer was 15μ. This material was supplied with 175Kv, 5mA, 5Mra.
By irradiating with an electron beam under the conditions of d, a colored sheet-like material that can be written on with a pencil or the like was obtained. This colored sheet material is water and heat resistant.

It showed excellent chemical crystal-resistant properties.

Example 3 First coating liquid: 200 parts water (solvent) 40 parts clay (filler) 5 parts sodium tripolyphosphate (dispersant) 1 part casein (
Binder) 5 parts Latex (Binder) 12 parts Neopentyl glycol diacrylate (electron beam curable resin) 10 parts were coated on 50μ polypropylene and dried with hot air to form a coating layer thickness of 8μ.

On top of this, as a second coating liquid, 200 parts of water (solvent), 90 parts of clay (filler), 10 parts of satin white (II), 10 parts of sodium tripolyphosphate (dispersing agent), 1 part of casein (
It was coated with 10 parts of latex (binder) and 5 parts of neopentyl glycol diacrylate (electron beam curable resin) and dried. The total thickness of the coated layer was 30μ.

The sheet material obtained by irradiating this material with an electron beam under the conditions of 200Kv 5 mAloMrad has excellent printability and water resistance.

It showed peeling resistance.

Function The electron beam curable resin dispersed in binders and fillers such as latex firmly adheres the binders and fillers as it hardens.

It appears to be resistant to peeling and water.

Effects The present invention is as described above, and according to the present invention, a sheet-like product having excellent peeling resistance and water resistance can be obtained by a method that does not cause fire or environmental pollution. The sheet-like material obtained can be used as a synthetic paper having not only the above properties but also excellent printability, or as a conductive sheet.
It can be effectively used in many ways as a sheet with functions such as a rust prevention sheet, a polishing sheet, and a release sheet.

Agent Yoshikuni Koizumi

Claims (1)

[Scope of Claims] 1. A surface layer is formed on the plastic sheet by coating a plastic sheet with an aqueous coating solution containing an electron beam curable resin, drying a dispersion medium such as water, and then irradiating the plastic sheet with an electron beam. A coated sheet material characterized by: 2. The sheet-like article according to claim 1, wherein the surface layer comprises a plurality of layers having different compositions.